Driving-sheave for steam-shovels.



, E. E. CRANE.

DRIVING SHEAVE FOR STEAM SHOVELS.

APPLICATION FILED JULY 6. 1916.

1,231,856., Patented July 3, 1917.

II'V VEN TOR ErnesZE. @ran e.

By Me A TTOR/VEVS ERNEST E. CRANE, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN MANGANESE STEEL COMPANY, OF AUGUSTA, MAINE, A CORPORATION OF MAINE.

DRIVING-SHEAVE FOR STEAM-SHOVELS.

re ress.

Specification of Letters Patent.

To all whom it may concern:

Be it known that I, ERNEST E. CRANE, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have made and invented certain new and useful Improvements in Driving- Sheaves for Steam-Shovels, of which the following is a specification.

more than ofisets the advantages derived from the additional length of life of the sheave. It is therefore the purpose of the present invention to provide a sheave where in the parts which are subject to wear are formed of extremely hard and serviceable material, such as manganese steel, and, fun

thermore, these parts are so constructed and arranged that they may be replaced from time to time as they become worn.

A further object. is to accomplish the aforementioned ends in a practical and expeditious manner, the various parts being so designed that the rivets or other holding means whereby the removable parts are secured in place are protected against wear and also free from high and excessive driving strains. 7

Other objects and advantages will appear as the description proceeds, wherein. it is to be understood that changes in the precise embodiment of the invention can be made within the scope of what is claimed without departing from the spirit thereof. In the drawings, the preferred embodiment of my invention is illustrated, wherein: Figure 1 -is a side view partly in section along a diametric plane of a sheave embodying the characteristic features of my invention;

Fig. 2 is a section on line 22 of Fig. 1. Referring specifically to the several views,

the sheave is formed with the usual hub 5, spokes or webs 6, and grooved rim 7.

A. wearing liner or supplemental rim 8, preferably formed of manganese steel or other extremely hard wearing material, is positioned within the grooved rim 7 of the sheave, and is formed in sections, each sec tion being securely held within the grooved rim by the rivets or holding screws 9.. These rivets or holding screws extend through the outstanding and radial walls 10 of the supplemental rim or liner, and through the corresponding walls 11 of the rim of the sheave. The radial walls 10 of the wearing liner are provided with the countersunk openings 12 in which the head 13 of the holding rivets or screws, seats, thus allowing the holding rivets or screws to terminate flush with the surface of the wearing liner, and preventing their .contact withthe rope or chain which extends around the sheave.

The supplemental rim or wearing liner 8 is provided with the outstanding symmetrically spaced lugs l t which, projecting centrally from the radial walls of the wearing liner, define driving teeth adapted to engage a chain, and transmit power thereto, although it is to be understood in this connection that I do not limit my invention to any particular form of teeth or lugs, as the same may vary according to the character of the chain or cable which is to be driven. The hub of the sheave 5 is formed with a key slot 15, whereby power may be transmitted from the shaft upon which the sheave is mounted, to the rim 7, and in order that this power may be transmitted to the wearing liner without subjecting the holding means 9 to such stresses, the sections of the wearingliner are provided with the notches ing located directly beneath the drivingteeth 14, provide for the direct transmission of power to the latter, and a further advantage arising from this location of the notches resides in the fact that the removal of metal,

Patented July a, 119W.

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from the wearing liner does not weaken the liner, due to the excess of metal at these points by the presence of the driving teeth or lugs 14. 1

The tension of the cable or chain which extends around the sheave holds the supplemental rim or wearing liners in position and prevents undue strains from being brought to bear upon the holding rivets 9. After the liner hasbecome worn beyond use the rivets 9 are removed and a new liner inserted in place. This repair, although made at a small cost, is equivalent to the substitution of an entirely new sheave.

What I claimis:

A driving sheave comprising a hub and a standing side wal1s, a segmental liner fitting vwithin said grooved rim, said grooved rim being provided with spaced out-standing lugs, said' liner being provided with notches receiving said lugs therein and driving teeth formed upon said liner radially outward from said notches and adapted to reinforce and strengthen the liner adjacent said notches and further providing for the forced driving of a flexible element.

Signed at Chicago, in the county of Cook and State of Illinois, this 28th day of June,

A. D. 1916. ERNEST E. CRANE. Witnesses:

KENNETH J ENsE N, N. B. MYERS. 

